onevent buttons
when button.forward==1 do #increase speed
speed=speed+50
if speed>500 then
speed=500
end
end
when button.backward==1 do #decrease speed
speed=speed-50
if speed<-300 then
speed=-300
end
end
when button.center==1 do #stop robot
speed=0
motor.left.target=0
motor.right.target=0
end

onevent buttons
when button.forward==1 do #increase speed
speed=speed+50
if speed>500 then
speed=500
end
end
when button.backward==1 do #decrease speed
speed=speed-50
if speed<-300 then
speed=-300
end
end
onevent button.center
when button.center==1 do #stop robot
speed=0
motor.left.target=0
motor.right.target=0
end